Explore Maximal Potential Capacity Of Optical Networks Using Time Domain Hybrid Modulation Technique

The recent emerging time domain hybrid modulation(TDHM) technique is considered promising because it can realize continuous adaptation between spectral efficiency and transparent reach. This technique is expected to achieve more efficient spectrum utilization or higher transmission capacity than the traditional transmission technique based on discrete modulation formats. For the point-to-point transmission system, the benefit of the TDHM technique has been experimentally verified. However, its benefit from the whole network perspective has not been explored yet. In this thesis, we apply the TDHM technique to the optical network to maximize its transmission capacity.To evaluate the benefit of this technique, we consider the routing and wavelength assignment(RWA) problem for the TDHM-based WDM network, for which we develop an Integer Linear Programming(ILP) optimization model and a waveplane-based heuristic algorithm to maximize the total network transmission capacity for the cases with and without network protection. The simulation study shows that compared to the design with discrete modulation formats, the TDHM-based approach can significantly increase the network transmission capacity.In addition, we also consider the electronic traffic grooming for IP over elastic optical networks based on TDHM technique. We developed a heuristic algorithm that can jointly consider the traffic grooming problem in the IP layer and routing and spectrum assignment in the optical layer. Results show that the proposed algorithm can significantly increase the network spectrum utilization and reduce the hardware costs.